Maybe it's just me, but it seems like for one reason or another they're trying their best to keep Pym out of the MCU.

Granted we don't know how much of a focal point he'll be in the Ant-Man movie being that it's mainly going to be about Scott Lang, but with the Avengers sequel they'rel using a villain associated with Pym and yet he won't be in it.

I mean, does everyone behind the scenes just not like Pym?

I doubt it.

Edgar Wright just prefers Scott Lang and thinks his origin makes for a more interesting movie than Hank Pym's (which is fair), and Joss Whedon couldn't find an effective way to fit him into The Avengers movies. This things happen when you adapt things.